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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.2K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.7K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
5.7K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

2.3K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
2.3K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.8K

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Scalable iron-squarate MOF catalyst for efficient CO2 cycloaddition under mild conditions.

Paula García-Fraile1,2, Javier Ferrando-Ferrero1,2, Yolanda Pérez1,3

  • 1IMDEA Energy Institute, Advanced Porous Materials Unit, Avda. Ramón de la Sagra 3, 28935, Móstoles, Madrid, Spain. sergio.carrasco@imdea.org.

Chemical Communications (Cambridge, England)
|November 17, 2025
PubMed
Summary

A novel porous iron squarate metal-organic framework (MOF), IEF-40, demonstrates superior catalytic performance and stability. This earth-abundant material offers a cost-effective and eco-friendly alternative to cobalt-based catalysts.

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) are investigated for catalytic applications.
  • Iron-based MOFs offer potential as earth-abundant alternatives to precious metal catalysts.
  • Existing iron MOFs often lack the stability or activity required for widespread use.

Purpose of the Study:

  • To synthesize and characterize a new porous iron squarate MOF, IEF-40.
  • To evaluate the catalytic performance and stability of IEF-40.
  • To establish IEF-40 as a viable, cost-effective alternative to cobalt-based catalysts.

Main Methods:

  • Synthesis of IEF-40, an iron squarate MOF.
  • Characterization of IEF-40's structure, including open Fe(III) sites, defects, and mesoporosity.
  • Evaluation of catalytic conversion, stability, and recyclability.

Main Results:

  • IEF-40 was synthesized and found to be isostructural to FJUT-3(Co).
  • The material exhibits open Fe(III) sites, microwave-induced defects, and mesoporosity.
  • IEF-40 achieved the highest conversion rate reported for Fe-MOFs to date, with excellent stability and recyclability.

Conclusions:

  • IEF-40 represents a significant advancement in iron-based MOF catalysis.
  • The material provides a high-performing, stable, and recyclable earth-abundant catalyst.
  • IEF-40 is a promising low-cost alternative to expensive or toxic catalysts.